Energy flow through an ecosystem is
always
a) unidirectional
b) cyclic
c) reversible
d) multidirectional
The largest reservoir of nitrogen on our planet is………………
a) ocean
b) atmosphere
c) phage DNA
d) fossil fuels
Overgrazing results in………
a) retention of useful species
b) soil erosion
c) productive soils
d) all of these
The three R’s responsible for a better environment are……….
a) reduce, reuse, recycle
b) read, register, recall
c) random, reduce, recall
d) reduce, rebuild, restrict
A food web consists of…………………..
a) interlocking food chains
b) producers, consumers, decomposers
c) a portion of food chain
d) a set of similar consumers
Predation helps to maintain balance…………..
a) community
b) population
c) ecology
d) ecosystem
